In a Reddit IAmA. http://www.reddit.com/r/IAmA/comments/r62jp/iama_nasa_astronaut_that_recently_returned_to/c437ubd (2012)
An earlier similar quotation can be found in:
The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right!
By Larry Niven As quoted by Arthur C. Clarke in "Meeting of the Minds : Buzz Aldrin Visits Arthur C. Clarke" by Andrew Chaikin (27 February 2001) http://web.archive.org/web/20010302082528/http://www.space.com/peopleinterviews/aldrin_clarke_010227.html
Ronald J. Garan, Jr.:
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